Objective To investigate the constituent ratio and clinical features of diffuse interstitial lung disease(DILD) in Tianjin city,and to identify the questions of diagnosis and management of DILD.Methods Data was collected from inpatients with DILD in ten general hospitals in Tianjin from 2003 to 2009 for statistical analysis of the constituent ratios of DILD in the respiratory department and in the whole hospital,clinical manifestations,lung function,blood gas and pathological examination.Results The average...